72 lines
2.4 KiB
Java
72 lines
2.4 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package org.jboss.netty.util.internal;
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import java.lang.reflect.Method;
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import java.nio.ByteBuffer;
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/**
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* This is fork of ElasticSearch's ByteBufferAllocator.Cleaner class
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*/
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public final class ByteBufferUtil {
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private static final boolean CLEAN_SUPPORTED;
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private static final Method directBufferCleaner;
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private static final Method directBufferCleanerClean;
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static {
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Method directBufferCleanerX = null;
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Method directBufferCleanerCleanX = null;
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boolean v;
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try {
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ByteBuffer direct = ByteBuffer.allocateDirect(1);
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directBufferCleanerX = direct.getClass().getMethod("cleaner");
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directBufferCleanerX.setAccessible(true);
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Object cleaner = directBufferCleanerX.invoke(direct);
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try {
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Runnable runnable = (Runnable) cleaner;
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directBufferCleanerCleanX = Runnable.class.getDeclaredMethod("run");
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} catch (ClassCastException ignored) {
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directBufferCleanerCleanX = cleaner.getClass().getMethod("clean");
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}
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directBufferCleanerCleanX.invoke(cleaner);
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v = true;
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} catch (Exception e) {
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v = false;
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}
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CLEAN_SUPPORTED = v;
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directBufferCleaner = directBufferCleanerX;
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directBufferCleanerClean = directBufferCleanerCleanX;
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}
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/**
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* Destroy the given {@link ByteBuffer} if possible
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*/
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public static void destroy(ByteBuffer buffer) {
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if (CLEAN_SUPPORTED && buffer.isDirect()) {
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try {
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Object cleaner = directBufferCleaner.invoke(buffer);
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directBufferCleanerClean.invoke(cleaner);
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} catch (Exception e) {
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// silently ignore exception
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}
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}
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}
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private ByteBufferUtil() {
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// Utility class
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}
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}
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